It's based on a book written by a public policy researcher. He looks to be right wing but mainstream in America.
www.google.co.uk/amp/amp.washingtontimes.com/news/2018/feb/22/transgender-movement-rejected-growing-body-researc/
www.heritage.org/staff/ryan-anderson
I feel like the tide is turning with respect to allowing open debate. Male researchers writing on this is a big development.
I'm not American but I believe Washington post is a reputable paper.